Furnace grate



J. K. DUKAS FURNACE GRATE Dec. 26, 1939.

Filed Dec. 23, 1958 Patented Dec. 26, 1939 e UNITED .sT-Ares PATE.wir,y OFFICE u f l "n{2,184,292' l I. l

FUniyAoE GRATE l, -Jannes Kingston,

Appiicatio'n Deeembe'rfzs, rssarsiai-N0.1247,519 I I l' 5 Claims. (ci.

This invention relates to furnace grates, and has for its object the production of a simple and efficient grate which is so constructed as to facilitate the breaking up of cinders or clinkers, whereby the broken particles may be conveyed out from the fire-box to a suitable point of dis.

posal.

A further obj ect of this invention is the production of a simple and efficient grate bar having a plurality of projecting prongs formed thereon, and which are arranged so as to dislodge the ashes which become caked or clinkered, and to facilitate the crushing thereof whereby the removal of the ashes may be facilitated.

Other objects and advantages of the present invention will appear throughout the following specification and claims.

In the drawing:

Figure 1 is a side elevational View of a furnace, certain parts being shown in section;

Figure 2 is a horizontal sectional View taken on line 2--2 of Figure 1;

Figure 3 is a vertical sectional view taken on line 3-3 of Figure 1;

Figure 4.- is a fragmentary top plan view of the grate operating mechanism;

Figure 5 is a fragmentary sectional perspective view of a portion of the grate structure showing the manner in which the grate bar supporting to convey the ashes out through the tubes I2 also similar to the tubes 29 shown in my application above identified. Between the spiral conveyors I I are mounted a plurality of rollers I3, which rollers are arranged in spaced relation and are supv ported upon the journal blocks I4, the journal blocks I4 being supported upon the division plates I5, which plates I5 are carried by the sides of the furnace I0 and are supported in any suitable or desired manner. These division plates I5 are provided with longitudinally extending supporting ribs I6 upon which the journal blocks I4 t and vertically extending ribs I1 are formed upon the division plates I5 to hold the blocks I4 in properly spaced and upright positions.

Grate bars I8 extending longitudinally of the furnace I0 are slidably mounted in any suitable or desired manner andrest upon the upper` faces of the rollers I3as shown in Figure 3. These grate bars are provided with alternately arranged oppositely vextending raker teeth I9, the teeth of each grate bar I8 being spread alternately to the right and left and flaring laterally, as shown in Figures 2 and 3.

Each bar I8 is provided with extending shanks 20 and 2l, the shanks 20 being connected to suitable operating levers 22 which are pivoted at their lower ends, as at 23. The bars I8 are connected to the levers 22 in a manner so as to cause the bars to alternately shift in opposite directions, one moving forwardly while the other moves rearwardly in a raking action, and this action is provided through the medium of the crank and link connection 24 similar to that shown in my previous application above identified.

As shown in Figure l, the longitudinally extending grate bars I8v are located just above the spiral conveyors II, the spiral conveyors extending transversely of the lire-box, and these grate bars I8 are mounted for forward and rearward sliding movementupon the supporting rollers I3. As the grate bars I8 are reciprocated forwardly and rearwardly, the alternate bars operating in opposite directions, a raking action will be produced through the mechanism of the teeth I9 which will tend to break the cakes or clinkers formed at the bottom of the fire-box, and efflciently crush the clinkers or cakes, whereby the smaller particles may drop down through the lower rollers and upon the conveyors II, many of the particles being conveyed to the side of the furnace by the spiral conveyors I I and certain other particles and ne ashes dropping down into the ashpit 25.

In the form of my invention shown in this application, I prefer to mount the operating mechanism for the grate bars I8 at the rear of the ofthe front door 26 and the ash-pit door 21.

It should be understood that certain detail changes in the mechanical structure `may be employed without departing from the spirit of the furnace, that is to say so as to be out of the way invention, so long as such changes fall within veyors, and means for reciprocating the grate bars longitudinally.

2. A furnace grate of the class described comprising a plurality of aligned spiral conveyors, a plurality of grate bars extending transversely of the spiral conveyors and above the spiral conveyors, and means for alternately reciprocating the grate bars longitudinally.

3. A grate of the class described comprising a frame, a plurality of transversely extending spaced spiral conveyors, a plurality of grate bars extending longitudinally and in transverse relation with respect to the spiral conveyors, rollers supporting said grate bars, and means for alternately reciprocating the grate bars transversely of the spiral conveyors.

4. A grate of the class described comprising a frame, a plurality of transversely extending spaced spiral conveyors, a plurality of grate bars extending longitudinally and in transverse relation with respect to the spiral conveyors, rollers supporting said grate bars, means for alternately reciprocating the grate bars transversely of the spiral conveyors, eaclji grate bar having a plurality of tapering spreading teeth projecting upwardly of the grate bars.

5. A grate of the class described comprising a frame, a plurality of transversely extending spaced spiral conveyors, a plurality of grate bars extending longitudinally and in transverse relation with respect to the spiral conveyors, rollers supporting said grate bars, means for alternately reciprocating the grate bars transversely of the spiral conveyors, journal blocks supporting said rollers, division plates supporting said journal blocks, and ribs carried by the plates for supporting the journal blocks in vertical spaced relation.

JAMES K. DUKAS. 

